jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/concurrentG1RefineThread.hpp@6270f80a7331

6890137: G1: revamp reachable object dump
Summary: Revamp the reachable object dump debugging facility.
Reviewed-by: jmasa, apetrusenko

     1 /*

     2  * Copyright 2001-2009 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 // Forward Decl.

    26 class ConcurrentG1Refine;

    28 // The G1 Concurrent Refinement Thread (could be several in the future).

    30 class ConcurrentG1RefineThread: public ConcurrentGCThread {

    31   friend class VMStructs;

    32   friend class G1CollectedHeap;

    34   double _vtime_start;  // Initial virtual time.

    35   double _vtime_accum;  // Initial virtual time.

    36   int _worker_id;

    37   int _worker_id_offset;

    39   // The refinement threads collection is linked list. A predecessor can activate a successor

    40   // when the number of the rset update buffer crosses a certain threshold. A successor

    41   // would self-deactivate when the number of the buffers falls below the threshold.

    42   bool _active;

    43   ConcurrentG1RefineThread *       _next;

    44  public:

    45   virtual void run();

    47   bool is_active()  { return _active;  }

    48   void activate()   { _active = true;  }

    49   void deactivate() { _active = false; }

    51  private:

    52   ConcurrentG1Refine*              _cg1r;

    54   double                           _interval_ms;

    56   void decreaseInterval(int processing_time_ms) {

    57     double min_interval_ms = (double) processing_time_ms;

    58     _interval_ms = 0.8 * _interval_ms;

    59     if (_interval_ms < min_interval_ms)

    60       _interval_ms = min_interval_ms;

    61   }

    62   void increaseInterval(int processing_time_ms) {

    63     double max_interval_ms = 9.0 * (double) processing_time_ms;

    64     _interval_ms = 1.1 * _interval_ms;

    65     if (max_interval_ms > 0 && _interval_ms > max_interval_ms)

    66       _interval_ms = max_interval_ms;

    67   }

    69   void sleepBeforeNextCycle();

    71   // For use by G1CollectedHeap, which is a friend.

    72   static SuspendibleThreadSet* sts() { return &_sts; }

    74  public:

    75   // Constructor

    76   ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread* next,

    77                            int worker_id_offset, int worker_id);

    79   // Printing

    80   void print() const;

    81   void print_on(outputStream* st) const;

    83   // Total virtual time so far.

    84   double vtime_accum() { return _vtime_accum; }

    86   ConcurrentG1Refine* cg1r()                     { return _cg1r;     }

    88   void            sample_young_list_rs_lengths();

    90   // Yield for GC

    91   void            yield();

    93   // shutdown

    94   void stop();

    95 };

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